My bedroom air return's are ceiling height. This allows cold air to back draft into the room when the furnace is not running. Installing these dampers directly into the 7" duct corrected the problem. Bedrooms definitely stay warmer at night now. I did have to remove (the center) 1 of 3 damper springs for the baffles to open fully. When closed, the baffles seat on a foam ring completely sealing off back draft air. Perfect product.

Easy to install and works well. It's hard to find a backdraft round damper this size. The unit because of its ease of use gives you flexibility to test it at different locations before deciding on a permanent location. Move it around and make sure it is opening. The unit opened even on the lowest setting of the 3 speed Broan exhaust for our kitchen.

After installing a new range hood with a damper bought from my local Ace Hardware store the damper rattled. This was particularly annoying since I bought an expensive hood so that it would be quiet. A little research turned up this damper and it's worth every penny. The installation was simple and the damper is a quiet as can be. I'm happy and better yet - so is my wife!

I installed this product in both bathroom vent systems and the exhaust duct for the microwave oven. this solved the problem of hot or cold air from entering the house from the roof vent. Installation could not have been easier.

Our bathroom vents were blowing cold air and our house always had a chill in it. We installed these dampers and it has made a 100% difference. The air no longer blows in. Our house is warmer, they were easy to install and work perfectly. Such an easy thing to do but the results are more then I expected.